Answer
The balancer evaluates chunk counts, data size, and cluster history. It throttles migrations and uses metadata from config servers for safe relocation.
Quick Answer
The balancer checks chunk counts across shards every 10 seconds. It triggers migration when the imbalance (most chunks - fewest chunks) exceeds a threshold based on total chunk count. It picks the chunk to move based on size and migration history. You can configure balancerCollectionStatus to check, and set chunksize to control when splits occur. The config server coordinates all migration metadata.
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SugharaIQ Editorial Team
Verified Answer
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Source: SugharaIQ